Collection/Object selection to the exclusion of everything else - unable to exit
When I load your file,  I see the ground and some stones in solid mode, and they're still there if I switch to Material Preview or Render Mode, though the HDRI file is missing, so I get a magenta "missing texture" in Render view.

If you were hitting Shift-1, etc. on the top row with emulate numpad turned off, that would have toggled visibility of different collections in the outliner.  I'd suggest going through the outliner systematically and clicking all the closed eyelids to open eyes, if you haven't already tried that.  If you made lights or environment invisible, it might be too dark to see in Render mode.



The only other thing I can think of is that you may have hit Shift-H to hide everything but the selected object.  If so, I don't know why it's not showing the same issue for me.  Anyway you can try reloading your file and hitting Alt-H to unhide.